the bend table is ment to be modified to match your companies bend
allowances and bend radius. For example, we use a lot of 18ga CRS (.047)
they don't show a .047 sheet thickness so I added a new table for the for
.047 thickness and under the .031 bending radii I set the value to .078 for
the 90 degree bend. Also for the .060 sheet thickness, .031 bending radii we
found that for a 90 degree bend we found a bend allowance of .094 worked
better than the .109457 value found in the table so I modified that table to
match our companies tried and true bend allowances.